... the front, there is the H.V. operation room, including H.V. bushings, on-load tap changer, off-circuit tap changer, inset fuse, pressure ... and cooling equipments. Features : A, four pole type construction core, fuse and L.V. winding are connected in series as a phase ... who need single-phase distribution. B, three pole type construction core, with H.V. windings be triangle or star, more suited for ...